Christopher Payne photographs North Brother Island in his book, North Brother Island: The Last Unknown Place in New York City (PHOTOS).

Between the 1880s and the 1930s, North Brother Island was the site of Riverside Hospital, where those suffering from infectious disease were treated in isolation. After World War II, it served as a housing community for returning veterans and their families. In the 1950s and early 1960s, it became a juvenile drug treatment center. While Payne knew the island’s story, he often had trouble finding physical evidence of its past. “It was very hard for me to find the artifacts I expected to find. They really just didn't exist. Most of the time you're looking at the shell of a building, and it's so far gone you can't even tell what it was used for. It forced me to look closer, to see graffiti on the walls or to look on the floor,” he said. “A lot of it was detective work. It was like trying to invent a life for something, trying to find a shot or a view that suggested what it used to be.”

Christopher Payne photographs North Brother Island in his book, North Brother Island: The Last Unknown Place in New York City (PHOTOS).